Miranda Kerr has given her fans a special sexy Santa surprise. The 28-year-old Victoria Secret model posted a photo of herself in festive lingerie on photo-sharing-app Instagram, captioned with the words "Santa's little helper".

So far more than 65,000 fans have liked her racy Christmas attire.

Kerr also shared her secret for staying in shape over the holidays. The Australian model is famously health conscious and doesn't let her routine slip even when it's Christmas.

She has advised women who are worried about their figures to follow in her footsteps, explaining some exercises don't need to have a huge impact on the day.

"I do have a little secret though, and that is doing the plank pose and holding that for a good like 15-20 minutes while moving from your side to back down on your elbows and back up on your hands again. If you can do that for like 15 minutes that's a full body workout! It really just gets all the muscles," she told modelinia.com.

Kerr is also careful to look after her skin during the festive season, as even she indulges in unhealthy snacks occasionally. There are some hero products she couldn't live without and cites rosehip body oil as particularly vital when the weather turns cooler.

"For me it has always been about the skin, and keeping it fresh and clean and hydrated for the winter months especially. My favourite thing is my Rosehip Body Oil, which contains all of your fatty acids and it's high in vitamin C - that's really the secret to my skin. I always cleanse and moisturise and I make sure to keep it well-nourished," she explained.